Furnace door



April"24, 1945.

c. A. MARTIN ET AL FURNACE DOOR Filed March 20, 1942 2 Sheets- Sheet l April 24, 1945.

c. A. MARTIN ET 2,374,611

FURNACE DOOR Filed March 20, 1942 2 Sheets-Sheet 2 Patented Apr. 24, 1945 FURNACE noon Charles A. Martinandilohn F. Farris, I

Nashville, Tenn.

Application March 20, 1942, Serial No. 435,576

1 Claim.

adapted to be expeditiously installed for operation on a conventional furnace or boiler front without the necessity of making material struc tural alterations therein.

Other objects of the invention are to provide a furnace or boiler door of the character described which will be comparatively simple in construction, strong, durable, highly efiicient and reliable in use, compact and which may be man ufactured and installed at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a view in front elevation of a furnace or boiler door constructed in accordance with the present invention.

Figure 2 is a view in horizontal section, taken substantially on the line 2 -2 of Figure 1.

Figure 3 is a vertical sectional view, taken substantially on the line 33 of Figure 2.

Figure 4 is a vertica1 sectional view, taken substantially on the line l4 of Figure 1.

Figure 5 is a top plan view of the air manifold.

Figure 6 is a fragmentary view in elevation of one end portion of the air manifold.

Referring now to the drawings in detail, it will be seen that the embodiment of the invention which has been illustrated comprises a substantially oval body which is designated generally by the reference numeral I, said body being of hollow metallic construction for providing a chamher 2. The body I is hingedly secured at one end, as at 3, for swinging movement in a horizontal plane on the usual front 4 of a conventional furnace or boiler. The hinge 3 permit limited vertical movement or play of the body I. A suitable latch 5 is provided on the free. end of the body I.

Extending through the body I is a centrally located draft tube 6. A'suitable damper I on the front of the body I controls the draft tube 6.

Extending through the body I and projecting plurality of bolts 9. Mounted on the inner end,

portions of the bolts 9 is a liner I0. Sleeves II on the: bolts 9 space the liner Ill from the inner wall of the body I.

The lower portion of the peripheral wall of the body I has formed therein a beveled opening I2. Extendingbetween the opening I2 and the draft tube 8 in the body I i a substantially Y-shaped baflie I3. Mounted on the draft tube 6 is a pair of oppositely inclined baflles I I which constitute what may be considered continuations of the branches or arms of the substantially Y-shaped baffle l3.

Projecting outwardly from the upper portion of the inner wall of the body I, between the upper end portions of the bailies I4, is a discharge neck I5. The liner It ha formed therein an opening It which accommodates the discharge neck ing 8, is an air manifold II in the form of an elongated casing. On one end, the manifold IT is provided with an intake neck I8 for connection with a suitable source of air. A horizontally siidable access door or plate I9 is provided on the other end of the manifold Il. Risingrfrom this end portion of the manifold H is an outlet branch or neck 211 having a beveled upper end portion which is adapted to seat in the correspondingly shaped opening ii in the body I. In this manner a substantially air-tight joint or connection is had between the door and the air manifold when said door is in closed position.

It is thought that the operation of the device will be readily apparent from a consideration of the foregoing. Briefly, air from a blower or other passing the draft tube 6 and turmoil is kept at i a minimum. The outlet l5 discharges the air into the furnace or boiler over the fire therein. By simply lifting the door sufliciently to clear the outlet branch 20 of the air manifold II, said door may bereadily swung to open position on the It is believed that the many advantages of a furnace or boiler door constructed in accordance with the present invention will be readily understood, and although a, preferred embodiment of the device is as illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts may be resortedto which will fall within the scope of the invention as claimed.

What is claimed is: I

In a furnace including a front having an opening therein, a horizontally elongated manifold mounted on said front below the opening said manifold having an air intake opening in one end, a slidable access-door on the other end of the manifold, a discharge neck rising from the manifold, and a vertically movable hollow door hingedly mounted for horizontal swinging movement on the furnace front for controlling the opening therein, said door having an opening therein for the reception of the neck, said neck including a beveled free end adapted to seat in the door opening, the door further havinga discharge opening therein communicating with the furnace.

CHARLES A. MARTIN. JOHN F. FARRIS. 

